For some preview purposes, it may be possible to export some views from SolidWorks assembly files (.sldasm) and save them as JPEG (.jpg, .jpeg) or PNG (.png) pictures. So not a conversion in a proper sense, just a preview export. Can be probably done in lots of programs with SolidWorks format supports.
Convert SolidWorks assembly data to Portable Network Graphic.
We have found 3 software records in our database eligible for .sldasm to .png file format conversion.
Microsoft Windows software - convert sldasm to png on Windows
A widely-used 3D animation application from Autodesk
Convert from sldasm file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned sldasm to png. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A 3D CAD translation softwate
A 3D product data optimalization software